During which time period do toddlers begin testing cause and effect to see what the outcome of an action might be?
A. Two to six months
B. Six to 12 months
C. 12 to 24 months
D. 24 to 36 months

Suppose you calculate that elasticity of demand for cigarettes is 0.5. you can conclude that: a. demand for cigarettes is elastic b. demand for cigarettes is unitary elastic c. a 1% increase in price of cigarettes will result in a 0.5% decrease in quantity demanded d. a 1% increase in the price of cigarettes will result in a 0.5% increase in quantity demanded.

Nina has the flu and a high fever. her immune system is exhibiting the line of defense. this defense is part of immunity.

If bp readings are consistently 145 mm hg/99 mm hg over a period of time, the patient likely has a. prehypertension. b. normal bp. c. hypertension. d. hypotension.